can't chance my surname for seven years

I have lodged the first request in 2008, as my particulars on my Vodacom account are wrong. Apparently no-one at the entire Vodacom company is authorised to change my particulars, despite me sending them copies of my ID via fax and email over ten times. Every time I renew my contract, the sales person assures me that my particulars will be changed, but they are obviously only interested in commission and don't give a damn about anything else. Vodacom has this \rate our service"thing and despite low ratings"